BALTIMORE, Md. (WJLA) — An investigation into the death of Baltimore resident Freddie Gray has found no evidence that his fatal injuries were caused during the videotaped arrest and interaction with police officers, according to multiple law enforcement sources.

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The sources spoke to ABC7 News after being briefed on the findings of a police report turned over to prosecutors on Thursday as well as preliminary findings made by the medical examiner’s office.

Sources said the medical examiner found Gray’s catastrophic injury was caused when he slammed into the back of the police transport van, apparently breaking his neck; a head injury he sustained matches a bolt in the back of the van.

Details surrounding exactly what caused Gray to slam into the back of the van was unclear. The officer driving the van has yet to give a statement to authorities. It’s also unclear whether Gray’s head injury was voluntary or was a result of some other action.